Apparently it was Leo DiCaprio who set her on her vegetarian ways!! Here's what she said about their past together:

"I hung out with Leonardo DiCaprio when I moved to New York. He was vegetarian and he'd talk about how dirty meat is and how bad factory farming is. I haven't eaten red meat in 20 years and although Leo's not totally responsible, he definitely planted a seed. When I turned seriously macrobiotic, it coincided with my father having been diagnosed with cancer [in 1999]. I felt I could heal him by proxy."

We're kidding about the whole confusion thing, btw! Gwyn's health scare happened in 2011 — years after she became a vegetarian. You see, she's not just a vegetarian now! She has a waaaay more strict diet than that! The timeline makes sense, trust us! LOLz!